Countertops: Dip the cut side of a lemon half in baking soda to tackle countertops; wipe with a wet sponge and dry. Don’t use on delicate stone, like marble, or stainless steel (it may discolor). Cutting boards: To remove tough food stains from light wood and plastic cutting boards, slice a lemon in half, squeeze onto the soiled surface, rub, and let sit for 20 minutes before rinsing. Dishes: To increase the grease-cutting power of your dishwashing detergent, add a teaspoon of lemon juice. Faucets: Combat lime scale by rubbing lemon juice onto the taps and letting it sit overnight. Wipe with a damp cloth. Garbage disposal: Cut a lemon in half, then run both pieces through the disposal. “The lemon cleans it and makes it smell great,” says Linda Mason Hunter, a coauthor of Green Clean ($13.50, amazon.com). Grout: Spilled morning coffee on your tile countertop or backsplash? Here’s how to tackle grout stains: Add lemon juice to 1 or 2 teaspoons cream of tartar (an acidic salt that acts as a natural bleaching agent) to make a paste. Apply with a toothbrush, then rinse. Hands: When you touch raw fish, the smell can linger on your fingers. Rub your hands with lemon juice, which will neutralize the odor. Laundry: To brighten whites, add 1/2 cup lemon juice to the rinse cycle for a normal-size load. Plastic food-storage containers: To bleach stains from tomato soup and other acidic foods on dishwasher-safe items, rub lemon juice on the spots, let dry in a sunny place, then wash as usual.